Automatic stoker.



W. T. HANNA.

AUTOMATIC STOKER.

APPLICATION FILED JUNE 25, 1906.

Patented Dec. 27, 1910.

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AUTOMATIC 'STQKER. APPLICATION FILED JUNE 25, 1906.

979,850. Patented Dec.27, 1910.

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AUTOMATIC STOKER.

APPLICATION FILED JUNE 25, 1906.

, 979 50 Patented Dec.27, 1910.

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Wz'i'nesses Invenior Wz'ZZz'am T/7an/2a UNITED STATES PATENT OFFICE.

WILLIAM T. HANNA 0F CINCINNATI, OHIO, ASSIGNOR, BY'MESNE ASSIGNMENTS, TO

THE MECHANICAL CONSTRUCTION COMPANY, OF CINCINNATI, OHIO, A CORPO- RATION OF OHIO.

AUTOMATIC STOKER.

. Specification of Ietters Patent.

Patented Dec.2'7, 1910.

Application filed June 25, 1906. Serial No. 323,275.

To all whom 'it may concern:

Be it known that I, WILLIAM T. HANNA, a citizen of the United States, residing at Cincinnati in the county of Hamilton and State of Chio, have invented certain new and useful Improvements in Automatic Stokers, of which the following is a specification.

The object of my invention is to provide an improved stoker for automatically feeding fuel to boiler furnaces.

My invention consists in the combination and arrangement of parts hereinafter described and claimed.

In the drawings Figure 1 is a side elevation of a stoker embodying my invention;

' Fig. 2, a longitudinal section of the same;

' Fig. 3,. a section on line 3.3 of Fig. 2; Fig.

4, a section on line 44 of Fig. 2; Fig. 5, a front elevation of the stoker; Fig. 6, a section of the mechanism for operating the hopper feed; Fig. 7 a section on line 7-7 of Fig. 6; Fig. 8, a partial top plan view of the stoker with parts removed; and Fig. 9, a

perspective view of the stoker viewed from within the fire box.

A feed hopper A is mounted upon a rolling carriage B upon adjustable standards C, which are given ball and socket connections with the carriage and pivotal connections with the hopper. The hopper issetin a position inclining upwardly from its outer feed end toward its discharge end, and is provided with a screw conveyer E rotatably mounted therein. At its outer end the shaft .of the screw conveyer carries a gear 6 which meshes with an intermediate gear a which is driven by a gear f on shaft F. Shaft F has a universal joint connection 9 with a shaft G which is made in two telescoping sections splined together so as to permit the lengthening of the shaft without interfering with the transmission of power. At its inner end the shaft G has a universal joint connection with a shaft H which is mounted in a frame J and carries a gear 72. meshing with a gear is on a shaft K also mounted in end of the hopper.

the other, so that a practically continuous and powerful rotation of shaft K will be obtained. The rotations of shaft K are transmitted to the screw conveyer by means of shafts G and F and gears f and e so that a practically continuous and powerful rota-' tion of the screw conveyer is obtained to feed the fuel upwardly toward the discharge By inclining the hopper, the height to which the operator must raise the fuel is lessened and the splined telescoping shaft G and standards C permit adjustments of the hopper to diflerent positions. In order to prevent clogging of the fuel at the discharge end of the hopper I provide a converging hood a covering the conveyer at this end.

The fuel passing from hopper A enters a fuel chamber M whence it passes onto a feed plate N which is in the form of an inclined ridge, having directing guides 12. pivoted on the ridge sides. The guide shafts a are provided with handles 12*, which in c0njunction with the notched plate 11. permit adjustments of 'the guides to difi'erent positions. The feed plate and directing guides, above referred to, are described and claimed .in mv copending application October 10,

1910 Serial No. 282,142. An opening m in the top of chamber M permits inspection of the guldes and feed plate. Chamber M carries a plate m artially closing the usual door openingand secured to the usual door hinge lugs m by means of pin m passing through lugs m on the plate. The hopper A, chamber M, and feed plate N, are all secured together or formed integrally so that when pin m is withdrawn, they are all readily removed on carriage C to give access to the fire box.

Below the feed plate N is a blast casing O, which is secured to the inside of a standard p on a telescoping casing P and on the outside of standard is secured the valve casing Q, which carries the valve 9 and a steam engine 9' for operating the valve. The casing P telescopes onto a stationary casing R, forming a steam chamber 1' supplied by a pipe r. Casing P also forms a steam chamber p which is in open communication wlth chamber r through openings r in the end of casing R. Steam pipes 17 and 12 lead from chamber p to thevalve casing g and steam engine 9. A hand wheel S is rotatably secured to casing P at its outer end and carries a screw shaft threaded in the end of casing R. It will be seen by rotating hand wheel S, casing P may be Withdrawn from casing R until casing O is withdrawn from the door opening .of the furnace, when the -casing 0, valve casing g and steam engine may be ,rotated downwardly to unobstruct the door opening of the furnace.

The blast casing O is provided with a supply throat 0 terminating in a central port 0 and larger diverging side ports 0 which lead into a chamber 0 The chamber 0 is angular in form, each angular arm of which is set at right angles to ports .0 as shown in Fig. 3. Adjacent to the ports this chamber is of considerable height, but slopes abruptly to the discharge slit 0*, which is blasts will be supplied to blast casing O.

Thev blasts from throat o are delivered to chamber 0 by ports 0 and 0 in the form of a powerful divergent blast to either side and a weaker central blast. In chamber of, these blasts expand to some extent" and pass out through slit 0* in the form of a thin sheet retaining to a large extent, the initial direction and distribution of power imparted by the ports.

A distributing or firingplate T is set 7 within the door opening so as to project onto firing plate T. By adjusting the into the furnace just below the blast casing- O. This late slopes downwardly from casing O an is provided with a recess 25 in its forward end. In the sides of the plate are divergent channels t lying below the central portion and deepening as they extend outwardly. The walls'of thechannels are slightly inclined to the vertical and at their outer ends. the channels turn somewhat abruptly to a direction substantially at right angles to the general direction of the plate. At their outer ends the bottoms of the channels are recessed at 25 In operation, the coal or other fuel supplied to hopper A is fed by the screw conveyer to feed plate N whence it flows down uides n, this-fuel may be directed to di erent portions of plate T as desired. The general under the plate.

tendency of the channels and blasts from slit 0* is to throw the coal toward the sides and rear corners of the fire box adjacent to the door. The coal actually entering the channels strikes against the outer abruptly turned walls thereof and is distributed into the rear corners, while that which passes out over the channels is distributed toward the sides and farther forward, some of it striking the walls and rebounding toward the central portionbf the fire bed. By adjusting the guides n substantially all of the coal may be directed to one side of the fire box or the other; or to the center of the fire box or the stream of coal may be divided and different proportions sent to one side or the other. Thus it will be seen. that the distribution of the *coal is placed entirely under the control of the operator, who may direct it to those portions of the fire bed where most needed. By placing the firing plate below the slit 0 and giving the plate a general downward slope from its feed to its discharge end, the general tendency of the blasts is directed over the coal and thus the throwing of the coal upwardly to be drawn in the boiler fines by the draft, is obviated. The recesses t and t permit a portion of the coal to fall onto the fire bed While I have shown and described the preferred construction for carrying my invention into efiect, this is capable of variation without departin from the spirit of the invention. I therefore do not wish to be limited to the exact construction shown, but what I claim as new and desire to secure by Letters Patent is:

1. A distributing plate for blast feed stokers, provided with a central portion recessed at its forward end and divergent channels formed in its upper face lying below the central portion of the plate, substantially as specified.

2. A distributing plate for blast feed stokers provided with a central portion and divergent channels, formed in its upper face, lying below the-central portion of the plate and having their bottoms'recessed at their outer ends, substantially as specified. 3. A distributing plate for blast feed stokers provided with a central portion recessed at its forward end and divergent channels formed in its upper face lying ,below the central portion of the plate and having their bottoms recessed at their outer ends, substantially as specified.

4. A distributing plate for blast feed stokers sloping downwardly from its feed to its discharge end and provided wlth a central portion recessed at its forward end and divergent channels formed in its upper face lying below the central'portion of the plate and having-their bottoms recessed at their outer ends, substantially as specified.

5. In an automatic stoker, the combination ofa steam engine, a pair of shafts geared together, arms loosely mounted on the shafts and adapted to be operated-by the.

steam engine; connections between the arms and their shafts whereby reciprocations of the engine piston operate the shafts in opposite directions alternately, means for feeding fuel and an operative connection be-' I substantially-as specified.

7. In an automatic stoker, the combination of a firing plate; means for feeding fuel to the plate; a steam engine; a pair of shafts geared together; arms loosely mounted on the shafts; a saddle pivotally connected with the arms; a slot and pin connection between the saddle and the engine piston; pawl and ratchet connections between the arms and their shafts; and an operative connection between one of the shafts and the fuel feeding mechanism, substantially as specified.

8. In an automatic stoker; the combination of a firing plate; means for discharging a blast across the firing plate; a hopper adapted to supply fuel to the firing plate; a screw conveyer for delivering fuel from thehopper to the firing plate; a steam engine; a pair of shafts'geared together; arms loosely mounted on the shafts; pawl and ratchet connections between the arms and their shafts; a saddle pivotally connected with the arms; a slot and pin connection between the saddle and the engine piston; and a shaft having driving connections with one of the geared pair of shafts and the screw conveyer through the medium of universal joints, said shaft being made in two telescoping sections splined together, substantially as specified.

9. In an automatic stoker, the combina tion of a firing plate; means for discharging a blast across the firing plate; a hopper adapted to supply fuel to the firing plate; a

v rolling carriage; ad'ustable standards having ball and socket oints and pivotal bearing on the'hop er and carriage; a screw conveyer for'de ivering fuel from the hop per to the firing plate; a steam engine; a

' pair of shafts geared together, arms loosely mounted on shafts; pawl and ratchet connections between the arms and their shafts; a saddle ivotally connected with the arms; a slot and pin connection between the saddle and the engine piston; and a shaft having driving connections with one of the geared pair of shafts and the screw conveyer through the medium of universal joints, said shaft being made in two telescoping sections splined together, substantially as specified.

10. In an automatic stoker, the combination of, stationary casing forming a steam chamber; a casing telescoping upon the stationary casing and forming a steam chamher; a blast plate carried by the movable casing; a firing plate in front of the blast plate; a valve for supplying steam to the blast plate; a steam engine, for o era-ting the valve, carried by the movab e casing; a steam supply pipe communicating with the stationary casing; a steam communication between the movable casing and thevalve and valve 'operating engine; means for withdrawing the movable casing from'the stationary casing, and means for supplying ing the valve, carried by the movable casing;

fuel to the firing plate, substantially as a steam supply plpe communicating with the stationary casing; a steam communication between the chamber in the movable casing and the valve and valve operating engine; means for withdrawin the movable casing from the stationary casing; a ho per adapted to supply fuel to the firing p ate; a rolling carriage; adjustable standards having ball and socket connections with the carriage and pivotal connections with the hopper; a screw conveyer for delivering fuel from the hopper to the firing plate; a steam engine; a pair of shafts geared together; arms losely mounted on the. shafts; pawl and ratchet connections between the arms; a slot and pin connection between the saddle and the engine piston; and a shaft having driving connections with one of the'geared pair of shafts and thescrew conveyer through the medium of universal joints, said shaft being made in telescoping sections splined together, substantially as specified. Y

WILLIAM T. HANNA. Witnesses:

EDWIN W. KEMPER, BRAYTON G. RICHARDS. 

